As soon as they're in the hall, it turns out that Cuddy's diagnosis is a good one, as Emmy's BP is perfectly normal. House just didn't want Cuddy to know that she might have gotten one right. He tells Taub and Kumar to try to re-create the conditions Emmy was in when she had her first attack and see if it happens again. Right, because it worked out so well for her the first time.
Meanwhile, the other half of House's team is at the clinical trials. Hadley is forced to wait in the waiting room, where she sees one of her fellow guinea pigs. This woman is much further along in her disease than Hadley is. It's not a pretty sight. Hadley flashes back to her mother when she was in the later stages of the disease. And you know it's Hadley's mother because the girl watching her is perfectly cast as a young Hadley. She looks like her, but she's got Hadley's blank stare down pat. Dadley tends to her mother, and promises Hadley that it will be okay. It won't.